https://bugs.openldap.org/show_bug.cgi?id=9935

Issue ID: 9935 Summary: buffer overflow in UTF8StringValidate Product: OpenLDAP Version: 2.6.3 Hardware: x86_64 OS: Linux Status: UNCONFIRMED Keywords: needs_review Severity: normal Priority: --- Component: slapd Assignee: bugs@openldap.org Reporter: kimjuhi96@snu.ac.kr Target Milestone: ---

I get a heap buffer overflow running this on the latest openldap on git. Built with CFLAGS="-fsanitize=address" using clang 15.

./servers/slapd/slapd $(python2 -c 'print("-Td \x4c\x3d\xc2\x8c\xf0\xf0")')

SUMMARY: AddressSanitizer: heap-buffer-overflow (/home/juhee/project/foxfuzz/programs/network/openldap-ori/servers/slapd/slapd +0x3961ac) Shadow bytes around the buggy address: 0x0c047fffcb00: fa fa 00 06 fa fa 00 00 fa fa 00 07 fa fa 00 00 0x0c047fffcb10: fa fa 00 07 fa fa 00 00 fa fa 03 fa fa fa 00 05 0x0c047fffcb20: fa fa 02 fa fa fa 02 fa fa fa 03 fa fa fa 07 fa 0x0c047fffcb30: fa fa 02 fa fa fa 03 fa fa fa 06 fa fa fa 00 03 0x0c047fffcb40: fa fa 00 06 fa fa 00 02 fa fa 00 01 fa fa 00 04 =>0x0c047fffcb50: fa fa 00 00 fa fa 00 fa fa fa 00 02 fa fa[05]fa 0x0c047fffcb60: fa fa 00 00 fa fa fa fa fa fa fa fa fa fa fa fa 0x0c047fffcb70: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c047fffcb80: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c047fffcb90: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c047fffcba0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa Shadow byte legend (one shadow byte represents 8 application bytes): Addressable: 00 Partially addressable: 01 02 03 04 05 06 07 Heap left redzone: fa Freed heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 Stack after return: f5 Stack use after scope: f8 Global redzone: f9 Global init order: f6 Poisoned by user: f7 Container overflow: fc Array cookie: ac Intra object redzone: bb ASan internal: fe Left alloca redzone: ca Right alloca redzone: cb ==2202218==ABORTING

Stopped reason: SIGABRT __GI_raise (sig=sig@entry=0x6) at ../sysdeps/unix/sysv/linux/raise.c:50 50 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory. gdb-peda$ bt #0 __GI_raise (sig=sig@entry=0x6) at ../sysdeps/unix/sysv/linux/raise.c:50 #1 0x00007ffff78ca859 in __GI_abort () at abort.c:79 #2 0x00005555556eb04f in __sanitizer::Abort () at /home/juhee/project/foxfuzz/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp:143 #3 0x00005555556e8aac in __sanitizer::Die () at /home/juhee/project/foxfuzz/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_termination.cpp:58 #4 0x00005555556c5dda in __asan::ScopedInErrorReport::~ScopedInErrorReport (this=0x7fffffffc4d6, __in_chrg=<optimized out>) at /home/juhee/project/foxfuzz/llvm-project/compiler-rt/lib/asan/asan_report.cpp:192 #5 0x00005555556c6461 in __asan::ReportGenericError (pc=<optimized out>, bp=0x7fffffffd140, sp=0x7fffffffd138, addr=0x602000025af5, is_write=is_write@entry=0x0, access_size=0x1, fatal=0x1, exp=<optimized out>) at /home/juhee/project/foxfuzz/llvm-project/compiler-rt/lib/asan/asan_report.cpp:199 #6 0x00005555556c99d6 in __asan::ReportGenericError (pc=<optimized out>, bp=bp@entry=0x7fffffffd140, sp=sp@entry=0x7fffffffd138, addr=<optimized out>, is_write=is_write@entry=0x0, access_size=access_size@entry=0x1, exp=<optimized out>, fatal=0x1) at /home/juhee/project/foxfuzz/llvm-project/compiler-rt/lib/asan/../sanitizer_common/sanitizer_atomic_clang.h:74 #7 0x00005555556ca34c in __asan::__asan_report_load1 (addr=<optimized out>) at /home/juhee/project/foxfuzz/llvm-project/compiler-rt/lib/asan/asan_rtl.cpp:118 #8 0x00005555558ea1ad in UTF8StringValidate () #9 0x000055555581e5a7 in LDAPRDN_rewrite () #10 0x000055555581d059 in LDAPDN_rewrite () #11 0x0000555555820f7f in dnPrettyNormal () #12 0x0000555555a37d1d in slapdn () #13 0x000055555570901f in main () #14 0x00007ffff78cc083 in __libc_start_main (main=0x555555706ef0 <main>, argc=0x3, argv=0x7fffffffdfd8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffdfc8) at ../csu/libc-start.c:308 #15 0x000055555561011e in _start () at /home/juhee/project/foxfuzz/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_internal_defs.h:397